UW Burke Herbarium species comparison

Basal leaves lyrate-pinnatifid, petiolate, up to 2 dm. long, the terminal lobe ovate, with shallow, rounded lobes;

cauline leaves alternate, sessile, much reduced, pinnatifid with 4-6 linear to narrowly-lanceolate lobes, the terminal lobe deltoid-lanceolate.

Leaves alternate, broadly lanceolate or oblong to oblanceolate, up to 1.5 dm. long, petiolate, the lower ones pinnatifid, the segments often pointing backward, becoming pinnatifid with linear segments above.

Inflorescence of bractless racemes, often elongate to 3.5 dm. in fruit; pedicles erect, stout, 2-3 mm. long, enlarged at the tip to the thickness of the silique;

sepals 4, oblong-oblanceolate, 2 mm. long;

petals 4, pale yellow, 3-4 mm. long;

stamens 6;

style lacking, stigma 2-lobed.

Inflorescence of bractless racemes; pedicles stout, spreading, 4-10 mm. long;

sepals 4, somewhat spreading, 4 mm. long;

petals 4, pale yellowish, clawed, 6-8 mm. long;

stamens 6;

style lacking, stigma 2-lobed.

Siliques erect, tightly appressed, 8-15 mm. long, terete, linear but tapering to a beak-like tip;

valves 3-nerved;

seeds in 1 series.

Siliques linear, terete, 5-10 cm. long, slightly broader than the pedicles, spreading and rigid;

valves with a prominent mid-nerve and 2 evident lateral nerves;

seeds in 1 series.